1/6: (1/4x-1/3) - 3/8=1/40 ответ x=3

1/6: (1/4 х-1/3) - 3/8=1/40

1/6: (1/4 х-1/3) = 1/40+3/8

1/6: (1/4 х-1/3) = 1/40+15/40

1/6: (1/4 х-1/3) = 2/5

1/4 х-1/3=1/6:2/5

1/4 х-1/3=5/12

1/4 х=5/12+1/3

1/4 х=5/12+4/12

1/4 х=9/12

х=9/12:1/4

х=3